An inductor is a passive magnetic component used to store energy within a magnetic field in an electrical circuit. A magnetic field is created when a current flows through a conductor. As the current flow varies with time, the strength and size of the magnetic field varies, causing a voltage to be induced according to Lenze’s law across the inductor. This induced voltage across the inductor resists changes in current; this is known as choke. Voltage induced across an inductor can be characterized using the formula shown in the slide here. Inductance is the primary property parameter of an inductor. It describes the ability of an inductor to produce a self-induced voltage as a changing current flows through it and is measured in Henries.